// SPDX-License-Identifier: GPL-2.0-or-later /* * Support for NXT2002 and NXT2004 - VSB/QAM * * Copyright (C) 2005 Kirk Lapray <[email protected]> * Copyright (C) 2006-2014 Michael Krufky <[email protected]> * based on nxt2002 by Taylor Jacob <[email protected]> * and nxt2004 by Jean-Francois Thibert <[email protected]> */ /* * NOTES ABOUT THIS DRIVER * * This Linux driver supports: * B2C2/BBTI Technisat Air2PC - ATSC (NXT2002) * AverTVHD MCE A180 (NXT2004) * ATI HDTV Wonder (NXT2004) * * This driver needs external firmware. Please use the command * "<kerneldir>/scripts/get_dvb_firmware nxt2002" or * "<kerneldir>/scripts/get_dvb_firmware nxt2004" to * download/extract the appropriate firmware, and then copy it to * /usr/lib/hotplug/firmware/ or /lib/firmware/ * (depending on configuration of firmware hotplug). */ #define pr_fmt(fmt) … /* Max transfer size done by I2C transfer functions */ #define MAX_XFER_SIZE … #define NXT2002_DEFAULT_FIRMWARE … #define NXT2004_DEFAULT_FIRMWARE … #define CRC_CCIT_MASK … #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/string.h> #include <media/dvb_frontend.h> #include "nxt200x.h" struct nxt200x_state { … }; static int debug; #define dprintk(args...) … static int i2c_writebytes (struct nxt200x_state* state, u8 addr, u8 *buf, u8 len) { … } static int i2c_readbytes(struct nxt200x_state *state, u8 addr, u8 *buf, u8 len) { … } static int nxt200x_writebytes (struct nxt200x_state* state, u8 reg, const u8 *buf, u8 len) { … } static int nxt200x_readbytes(struct nxt200x_state *state, u8 reg, u8 *buf, u8 len) { … } static u16 nxt200x_crc(u16 crc, u8 c) { … } static int nxt200x_writereg_multibyte (struct nxt200x_state* state, u8 reg, u8* data, u8 len) { … } static int nxt200x_readreg_multibyte (struct nxt200x_state* state, u8 reg, u8* data, u8 len) { … } static void nxt200x_microcontroller_stop (struct nxt200x_state* state) { … } static void nxt200x_microcontroller_start (struct nxt200x_state* state) { … } static void nxt2004_microcontroller_init (struct nxt200x_state* state) { … } static int nxt200x_writetuner (struct nxt200x_state* state, u8* data) { … } static void nxt200x_agc_reset(struct nxt200x_state* state) { … } static int nxt2002_load_firmware (struct dvb_frontend* fe, const struct firmware *fw) { struct nxt200x_state* state = fe->demodulator_priv; u8 buf[3], written = 0, chunkpos = 0; u16 rambase, position, crc = 0; dprintk("%s\n", __func__); dprintk("Firmware is %zu bytes\n", fw->size); /* Get the RAM base for this nxt2002 */ nxt200x_readbytes(state, 0x10, buf, 1); if (buf[0] & 0x10) rambase = 0x1000; else rambase = 0x0000; dprintk("rambase on this nxt2002 is %04X\n", rambase); /* Hold the micro in reset while loading firmware */ buf[0] = 0x80; nxt200x_writebytes(state, 0x2B, buf, 1); for (position = 0; position < fw->size; position++) { if (written == 0) { crc = 0; chunkpos = 0x28; buf[0] = ((rambase + position) >> 8); buf[1] = (rambase + position) & 0xFF; buf[2] = 0x81; /* write starting address */ nxt200x_writebytes(state, 0x29, buf, 3); } written++; chunkpos++; if ((written % 4) == 0) nxt200x_writebytes(state, chunkpos, &fw->data[position-3], 4); crc = nxt200x_crc(crc, fw->data[position]); if ((written == 255) || (position+1 == fw->size)) { /* write remaining bytes of firmware */ nxt200x_writebytes(state, chunkpos+4-(written %4), &fw->data[position-(written %4) + 1], written %4); buf[0] = crc << 8; buf[1] = crc & 0xFF; /* write crc */ nxt200x_writebytes(state, 0x2C, buf, 2); /* do a read to stop things */ nxt200x_readbytes(state, 0x2A, buf, 1); /* set transfer mode to complete */ buf[0] = 0x80; nxt200x_writebytes(state, 0x2B, buf, 1); written = 0; } } return 0; }; static int nxt2004_load_firmware (struct dvb_frontend* fe, const struct firmware *fw) { struct nxt200x_state* state = fe->demodulator_priv; u8 buf[3]; u16 rambase, position, crc=0; dprintk("%s\n", __func__); dprintk("Firmware is %zu bytes\n", fw->size); /* set rambase */ rambase = 0x1000; /* hold the micro in reset while loading firmware */ buf[0] = 0x80; nxt200x_writebytes(state, 0x2B, buf,1); /* calculate firmware CRC */ for (position = 0; position < fw->size; position++) { crc = nxt200x_crc(crc, fw->data[position]); } buf[0] = rambase >> 8; buf[1] = rambase & 0xFF; buf[2] = 0x81; /* write starting address */ nxt200x_writebytes(state,0x29,buf,3); for (position = 0; position < fw->size;) { nxt200x_writebytes(state, 0x2C, &fw->data[position], fw->size-position > 255 ? 255 : fw->size-position); position += (fw->size-position > 255 ? 255 : fw->size-position); } buf[0] = crc >> 8; buf[1] = crc & 0xFF; dprintk("firmware crc is 0x%02X 0x%02X\n", buf[0], buf[1]); /* write crc */ nxt200x_writebytes(state, 0x2C, buf,2); /* do a read to stop things */ nxt200x_readbytes(state, 0x2C, buf, 1); /* set transfer mode to complete */ buf[0] = 0x80; nxt200x_writebytes(state, 0x2B, buf,1); return 0; }; static int nxt200x_setup_frontend_parameters(struct dvb_frontend *fe) { … } static int nxt200x_read_status(struct dvb_frontend *fe, enum fe_status *status) { … } static int nxt200x_read_ber(struct dvb_frontend* fe, u32* ber) { … } static int nxt200x_read_signal_strength(struct dvb_frontend* fe, u16* strength) { … } static int nxt200x_read_snr(struct dvb_frontend* fe, u16* snr) { … } static int nxt200x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) { … } static int nxt200x_sleep(struct dvb_frontend* fe) { … } static int nxt2002_init(struct dvb_frontend* fe) { … } static int nxt2004_init(struct dvb_frontend* fe) { … } static int nxt200x_init(struct dvb_frontend* fe) { … } static int nxt200x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) { … } static void nxt200x_release(struct dvb_frontend* fe) { … } static const struct dvb_frontend_ops nxt200x_ops; struct dvb_frontend* nxt200x_attach(const struct nxt200x_config* config, struct i2c_adapter* i2c) { … } static const struct dvb_frontend_ops nxt200x_ops = …; module_param(debug, int, 0644); MODULE_PARM_DESC(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; EXPORT_SYMBOL_GPL(…);
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